I tried with entityManager.find, createNativeQuery (Natives query over this model also doesn't work), createQuery, using "refresh" Hint .. nothing works.
This has been working on TopLink for years
Im using PostgreSQL 8.4

.........24hrs later
Hints usually are String... and IF the hints does not exist, no error is triggers (like "toplink.refresh" indeed "eclipselink.refresh")
From now.. I will use QueryHints.REFRESH so if I change the JPA persistence provider at least I will get a package error.
Well that its all.. and sorry if my english is not clear.